Reference surfaceHighly absorbent
Data source
PTB reference data
Physikalisch-Technische Bundesanstalt
Source: DNA-Tabelle 1968, b3-3
Value from the PTB table, not verified
Facing brickwork with open perpends, no spacing
PTB reference data
Original description
Facing brickwork with open perpends, no spacing
Material properties
Thickness: 55 mm
Dimensions: 230 x 50 x 55 mm
Measurement data
Sound absorption
ISO 354 – reverberation chamber
αw
0.35
Frequency values
αp nach ISO 11654
| f (Hz) | 125 | 250 | 500 | 1k | 2k | 4k |
|---|---|---|---|---|---|---|
| αp | 0.05 | 0.15 | 0.45 | 0.40 | 0.30 | 0.35 |
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Value from the PTB table, not verified
Measured values as a table (1 measurement)
| Build-up | αw | 100 Hz | 125 Hz | 160 Hz | 200 Hz | 250 Hz | 315 Hz | 400 Hz | 500 Hz | 630 Hz | 800 Hz | 1000 Hz | 1250 Hz | 1600 Hz | 2000 Hz | 2500 Hz | 3150 Hz | 4000 Hz | 5000 Hz | 6300 Hz |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 55 mm | 0.35 | 0.07 | 0.04 | 0.08 | 0.10 | 0.14 | 0.15 | 0.25 | 0.49 | 0.65 | 0.50 | 0.35 | 0.32 | 0.30 | 0.31 | 0.35 | 0.38 | 0.36 | 0.36 | 0.30 |
Measured values as a table (1 measurement)
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